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T <br /> <br />DEPARTMENT OF NATORA I. RE $1 )IJRCES <br />D. Monl r. Pascoe. Erecm lve Duecr or <br />1V11NEU LAND I~I'.(:LA111;~'1'ION <br />423 Centennial Building. 13 t 3 Sherman Slreet <br />Denver. Colorado 80203 Tel (303) 839-3567 <br />David C. Shelton <br />Director <br />28 July 1981 <br />Mr. Charles Silengo, jr. <br />Dorchester Coal Company <br />P. 0. Box 449 <br />Florence, Colo. 81226 <br />Dear Atr. Silengo; <br />This letter will serve to document our brief discussion of this <br />- morning, Tuesday, July 28th. During that discussion you asked whether <br />I would foresee any problems with revision of your mine plan to allow <br />extraction of the barrier pillars specified along the property boundary <br />between your company's property and neighboring Newlin Creek Mine. <br />You pointed out that contact with the State Bureau of Mines and tlTe <br />OSM suggested that no problem would be encountered iE concurrence was <br />obtained from the property owner, Mr. Vento, and from the neigboring <br />mining company, Newlin Creek (Harrison lJestern, Inc.). <br />The requirement of barrier pillars is to preclude subsidence <br />from effecting lands outside a company's control. Our regulations <br />and those of the OSM do not preclude subsidence, but only preclude <br />"material damage" due to subsidence. Assumin>; that concurrence with <br />your proposal is submitted by Mr. Vento and Harrison 1•lestern, and <br />that no material damage would result From subsidence within the area <br />previously protected by the barrier pillar, the revision to delete <br />the barrier pillars along the boundary between your mine and that of <br />the Newlin Creek Mine should be acceptable. At this point neither <br />Dorchester nor Newlin Creek has an approved plan under the premanent <br />regulatory program. Both have 'indicated that no "material damage" <br />will result from subsidence, however, approval of those opinions <br />is not final. <br />S~ely yo rs> __ <br />James Pendleton, Senior Geologist <br />cc: Peter Evans <br />Ed Bischoff <br />Jim Kent <br />